AD NUMBER: 2006-22-06
MANUFACTURER: Bombardier
SUBJECT: Airworthiness Directive 2006-22-06 SUMMARY: The FAA is
superseding an existing airworthiness directive (AD) that applies
to certain Bombardier Model CL-600-2B16 (CL-604) airplanes and
Model CL-600-2B19 (Regional JetSeries 100 & 440) airplanes.
These models may be referred to by their marketing designations as
RJ100, RJ200, RJ440, CRJ100, CRJ200, CRJ440, and CL-65. The
existing AD currently requires revising the Emergency Procedures
section of the airplane flight manual (AFM) to advise the
flightcrew of additional procedures to follow in the event of
stabilizer trim runaway. For certain airplanes, the existing AD
also requires revising the Abnormal Procedures section of the AFM
to advise the flightcrew of procedures to follow in the event of
MACH TRIM, STAB TRIM, and horizontal stabilizer trim malfunctions.
This AD requires revising the same Emergency and Abnormal
Procedures sections of the AFM to advise the flightcrew of revised/
additional procedures. This AD also requires revising the Normal
section of the AFM to require a review ofthe location of certain
circuit breakers and a functional check of the stabilizer trim
system. This AD also requires installing circuit breaker
identification collars and provides an optional terminating action
for the requirements of the AD. This AD also removes airplanes from
the applicability of the existing AD. This AD results from reports
of uncommanded horizontal stabilizer trim motion. We are issuing
this AD to ensure that the flightcrew is advised of appropriate
procedures to follow in the event of uncommanded movement or
stabilizer trim runaway. Failure to follow these procedures could
result in excessive uncommanded movement of the horizontal
stabilizer trim actuator (HSTA) and loss of ability to use trim
switches to override uncommanded movement or yoke disconnect
switches to disconnect the HSTA, which could result in reduction of
or loss of pitch control and consequent reduced controllability of
the airplane.
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